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Installed by the Minnesota & Northwestern Railroad in 1888, which became the Chicago Great Western Railway in 1892, then the Chicago & Northwestern Railroad in 1968, abandoned in 1972

The telegraph, invented by Samuel F.B Morse in 1844, opened nearly instant communication with the wider world, and railroads quickly lined their tracks with telegraph poles, continuing to use this infrastructure long after later inventions such as the telephone were commonplace. Today, a train's diesel horn still sounds the letter 'Q' in Morse code at all grade crossings: dash, dash, dot, dash.